[racket] How to convert a list of lists to a matrix?

From: Animesh Pandey (animeshpandey.etno at gmail.com)
Date: Fri Nov 28 11:51:13 EST 2014

I read a csv file and converted 150 rows and 4 columns to a list of 150
lists. I want to convert this list to a matrix of 150 X 4 dimensions.
Should I be using "build-matix" or "make-matrix"?
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